SG43986A1 - Compatible optical scanning device - Google Patents

Compatible optical scanning device

Info

Publication number
SG43986A1
SG43986A1 SG1996008699A SG1996008699A SG43986A1 SG 43986 A1 SG43986 A1 SG 43986A1 SG 1996008699 A SG1996008699 A SG 1996008699A SG 1996008699 A SG1996008699 A SG 1996008699A SG 43986 A1 SG43986 A1 SG 43986A1
Authority
SG
Singapore
Prior art keywords
wavelength
type
record carrier
read
scanning device
Prior art date
Application number
SG1996008699A
Inventor
Adrianus Petrus Joh Jongenelis
Van Gerard Eduard Rosmalen
Original Assignee
Philips Electronics Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronics Nv filed Critical Philips Electronics Nv
Publication of SG43986A1 publication Critical patent/SG43986A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals

Abstract

A device in which a radiation source generates a radiation beam of a first wavelength. The scanning spot 7 generated by this radiation beam follows the centerline 13 of a track 8 to be scanned on a first type of record carrier designed for this wavelength. When a second type of record carrier is being read, in which the information is stored in a phase structure designed for a wavelength which is longer than the first wavelength, the read spot 7 follows the edge of a track 38 to be read instead of the centerline 18. In this way it is possible to generate a satisfactory information signal not only from the first type of record carrier but also from the second type of record carrier.
SG1996008699A 1991-08-01 1992-07-24 Compatible optical scanning device SG43986A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91201991 1991-08-01

Publications (1)

Publication Number Publication Date
SG43986A1 true SG43986A1 (en) 1997-11-14

Family

ID=8207810

Family Applications (1)

Application Number Title Priority Date Filing Date
SG1996008699A SG43986A1 (en) 1991-08-01 1992-07-24 Compatible optical scanning device

Country Status (12)

Country Link
US (1) US5235583A (en)
JP (1) JP3101639B2 (en)
KR (1) KR100227443B1 (en)
CN (1) CN1044419C (en)
AT (1) ATE147185T1 (en)
CZ (1) CZ284509B6 (en)
DE (1) DE69216318T2 (en)
FI (1) FI923428A (en)
RU (1) RU2096836C1 (en)
SG (1) SG43986A1 (en)
SK (1) SK280110B6 (en)
TW (1) TW213519B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592448A (en) * 1992-05-08 1997-01-07 Hitachi, Ltd. Access control apparatus for optical disk according change of track pitch
JP2728835B2 (en) * 1992-10-26 1998-03-18 協栄産業株式会社 Semiconductor integrated circuit with built-in optical sensor
JPH07105549A (en) * 1993-09-30 1995-04-21 Canon Inc Optical information recording and reproducing method and optical information recording and reproducing device
BE1007852A3 (en) * 1993-12-03 1995-11-07 Philips Electronics Nv COMPATIBLE OPTICAL READING DEVICE.
JP3410869B2 (en) * 1995-04-11 2003-05-26 株式会社リコー Optical pickup device
JPH08329490A (en) * 1995-05-31 1996-12-13 Pioneer Electron Corp Tracking error signal generating device
JPH09204676A (en) * 1996-01-24 1997-08-05 Sony Corp Optical pickup and optical disc apparatus
DE19614970A1 (en) * 1996-04-17 1997-10-23 Thomson Brandt Gmbh Compatible recording or playback device
US6262954B1 (en) * 1997-09-30 2001-07-17 Kabushiki Kaisha Toshiba Optical disk apparatus
US6333907B1 (en) 1998-03-17 2001-12-25 Kabushiki Kaisha Toshiba Disk processing apparatus for reproducing information from a plurality of optical disks having different recording densities
JP2001014717A (en) 1999-04-28 2001-01-19 Matsushita Electronics Industry Corp Optical device
US6738326B1 (en) * 1999-07-07 2004-05-18 Matsushita Electric Industrial Co., Ltd. Apparatus and method for reproducing information from two types of optical disks having discrimination marks formed along tracks thereof
CN1602521A (en) * 2001-12-11 2005-03-30 皇家飞利浦电子股份有限公司 Optical scanning device
JP2009527868A (en) * 2006-02-24 2009-07-30 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Method and apparatus for reading data
EP1968048A1 (en) * 2007-03-08 2008-09-10 Deutsche Thomson OHG Optical storage medium and apparatus for reading of respective data

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL160138C (en) * 1972-05-11 1979-09-17 Philips Nv DEVICE FOR READING A FLAT REGISTRATION CARRIER.
FR2197495A5 (en) * 1972-08-25 1974-03-22 Thomson Csf
US4118734A (en) * 1974-02-14 1978-10-03 U.S. Philips Corporation Optical videodisc with variable width tracks
JPS6139248A (en) * 1984-07-31 1986-02-25 Toshiba Corp Optical information recording medium
JPS62117168A (en) * 1985-11-15 1987-05-28 Teac Co Information recording disc
JPH0679378B2 (en) * 1986-12-15 1994-10-05 ソニー株式会社 Tracking servo circuit for optical recording / reproducing apparatus
JPH0283830A (en) * 1988-09-20 1990-03-23 Victor Co Of Japan Ltd Optical type information recording medium reproducing device

Also Published As

Publication number Publication date
CN1069593A (en) 1993-03-03
RU2096836C1 (en) 1997-11-20
FI923428A0 (en) 1992-07-29
CN1044419C (en) 1999-07-28
CZ237592A3 (en) 1993-02-17
JP3101639B2 (en) 2000-10-23
TW213519B (en) 1993-09-21
DE69216318D1 (en) 1997-02-13
SK280110B6 (en) 1999-08-06
KR930004956A (en) 1993-03-23
FI923428A (en) 1993-02-02
US5235583A (en) 1993-08-10
SK237592A3 (en) 1994-11-09
JPH05205296A (en) 1993-08-13
DE69216318T2 (en) 1997-06-19
CZ284509B6 (en) 1998-12-16
ATE147185T1 (en) 1997-01-15
KR100227443B1 (en) 1999-11-01

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